Blender v4 support

[UuuNyaa]

Pull request for Blender 4.2 LTS destructive API changes.

Blender 4.x is currently under development with destructive API changes from 3.x.
And MMD Tools is focusing on support for LTS versions, as shown by the following URL: https://mmd-blender.fandom.com/wiki/MMD_Tools#Requirements
So this pull request will prepare for future 4.2 LTS.

• Bone Collections, Colors, Layers and Groups
  • https://wiki.blender.org/wiki/Reference/Release_Notes/4.0/Animation_Rigging/Bone_Collections_%26_Colors:_Upgrading
• Shader Nodes
• Overriding Context
  • https://docs.blender.org/api/current/bpy.ops.html#overriding-context
• Blend file migration
• Set a BL_Order to all the panels so that the panels stay in the exact same order every time you load blender #121
• Remove SceneOp
• Translation
  • https://projects.blender.org/blender/blender-ui-translations
• Code format
  • https://github.com/psf/black
• Remove legacy code
• Remove layers, calc_normals_split, free_normals_split, use_auto_smooth, calc_normals, auto_smooth_angle
• Deprecate Object.select and Object.hide properties
  • We should use alternative methods Object.select_set()/Object.select_get() and Object.hide_set()/Object.hide_get()

[UuuNyaa]

Models can now be loaded, but we still have a long way to go.

blender4-bone_layers.mp4